package com.example.community.entity;

/**
 * 封装分页相关信息
 */
public class Page {
    //当前页码
    private int current = 1;
    //显示上限
    private int limit = 10;
    //数据总数(计算总的页数)
    private int rows;
    //查询路径(用于分页链接)
    private String path;

    public Page() {
    }

    public Page(int current, int limit, int rows, String path) {
        this.current = current;
        this.limit = limit;
        this.rows = rows;
        this.path = path;
    }

    @Override
    public String toString() {
        return "Page{" +
                "current=" + current +
                ", limit=" + limit +
                ", rows=" + rows +
                ", path='" + path + '\'' +
                '}';
    }

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current>=1)
        {
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit>=1 && limit<=100)
        {
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if(rows >= 0)
        {
            this.rows = rows;
        }
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /**
     * 获取当前页起始行
     * @return
     */
    public int getOffset() {
        // current * limit - limit
        return (current - 1) * limit;
    }

    /**
     * 获取总页数
     * @return
     */
    public int getTotal(){
        if(rows % limit == 0)
            return rows / limit;
        else
            return rows / limit + 1;
    }

    /**
     * 获取起始页码
     * @return
     */
    public int getFrom() {
        int from = current - 2;
        return from < 1 ? 1 : from;
    }

    /**
     * 获取当前页码
     * @return
     */
    public int getTo() {
        int to = current + 2;
        int total = getTotal();
        return to > total ? total : to;
    }

}
